Retractable pen



FIG. 1 is a perspective view of a retractable pen in accordance with the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a side elevational view thereof.

The stippling shown on the grip and upper portion of the pen represents a surface texture. 

The ornamental design for retractable pen, as shown and described. 